Contract 0x8d2BFfCbB19Ff14A698C424FbcDcFd17aab9b905 3

 

Contract Overview

Unicly CryptoPunks: uPUNK Token
Balance:
185.267563696407108481 Ether

EtherValue:
$245,071.93 (@ $1,322.80/ETH)

Token:
 
Txn Hash
Method
Block
From
To
Value
0x8e1731b4fdc371573898d0350ab78aa2762f6d0011a8e4bc85b5a80f4a4bd56eTransfer156291562022-09-28 3:29:471 day 4 hrs ago0x0fbeecddbaf38595329399e166c106973e295f80 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.000405113.5
0x0112eed4a533cc4daf1b3fc6aacf6bd27001299e1ccd2fb1a81343a4fc883d98Transfer156291452022-09-28 3:27:351 day 4 hrs ago0x3a763f1048b1b0806088e3237920eefd924ecd62 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.000405113.5
0x04c8d06c8af32ac893eabc17649eff5009ca04e5aa7e63f7bac62d82e784eb77Transfer156291452022-09-28 3:27:351 day 4 hrs ago0x8343e9ac859a44baa3ff6aff2cb203eb6817bd7b IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0004054313.5
0x6c084c3a44209c790d7eceb8b2518bf0480eeb4a550cd24e45a4ab77800470abTransfer155944492022-09-23 7:07:116 days 1 hr agoMEXC: Mexc.com IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0007267114
0x9c557d93b9c2070e941dee53977367ee349a814d7bfd297b22ab9bb2e1a22f0bTransfer155849522022-09-21 23:15:237 days 9 hrs ago0xd7ac846bb0af58daf20a242ad4dd50fafb0fa33f IN  Unicly CryptoPunks: uPUNK Token0 Ether0.000382912.75
0x982597a1f184a2b627798f9d0f20355b61d948a08ad8510ab61fcbd41e315660Transfer155480062022-09-16 18:38:4712 days 13 hrs agoENS Name hydyrnazar.eth IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00034808 10
0x6f3d4db9d34f2242aa3714c95d13de8520ff0032293ad1b839a1c2f82eed8253Transfer155398622022-09-15 15:03:1113 days 17 hrs ago0xe31c164f668c67ed55a152b9ca3492e203f7ff7c IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0011712439
0x8d1cbfdd46c0b9ef53777fd67fc7fdc750fc2106b184a55acb29da99d7ee98d2Transfer155014582022-09-09 7:24:0620 days 51 mins agoMEXC: Mexc.com IN  Unicly CryptoPunks: uPUNK Token0 Ether0.001349626
0x6b28e52c29e2f58c15fc359e68f256df436fc7e37dc07f346e7e763149414bb8Redeem ETH154949452022-09-08 6:10:1221 days 2 hrs agoENS Name ilidan.eth IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0008357 17.26417137
0xf498c822d14fa5de703fd852168a97d842d7b215e821dd0114c24b5ded70e041Transfer154949392022-09-08 6:09:0021 days 2 hrs agoMEXC: Mexc.com IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0015370929.61182155
0x66f303a0713ba9c74a5f98e62e6b68a5de515465cb42a1e72c6d9595618536e2Approve154912202022-09-07 15:56:1721 days 16 hrs ago0xb93119fbc995c7b438b1944ba128f398b8c8117c IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00165815 35.52929475
0x1483eb4bced77662a57ccb190d96428aa49a6e824ecd65a7836fad887bbdab90Redeem ETH154786842022-09-05 15:48:5523 days 16 hrs agoENS Name ilidan.eth IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00096814 20
0x66d61b5b504d163ace8e6bf0e914812b0327d0609cb95a79db7cf6ff65dc6f20Transfer154786392022-09-05 15:37:4723 days 16 hrs agoMEXC: Mexc.com IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0023640245.54258745
0xeaa9aef52cc5029ffbcfeb0b61e2bcacb4e0f943dbf9697d0ff70c644a438382Redeem ETH154763942022-09-05 6:57:1124 days 1 hr agoENS Name ilidan.eth IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00026496 5.47372884
0x194a042c70ac1561b5d6524e7b02848e9d21d4750ea1dbe640ea75c5d6cb8dbaTransfer154763902022-09-05 6:55:5424 days 1 hr agoMEXC: Mexc.com IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0005709811
0xd4e873d33d26bb5d16aa6766a9978800c72cb3d82cf4fb9c0f1a36337e051ccdRedeem ETH154729342022-09-04 17:30:3824 days 14 hrs agoENS Name ilidan.eth IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00027342 5.64838134
0xe3f09fd11a0f178c4b188fcf8a760b5193389861b019d92c5c58508443797d28Transfer154729302022-09-04 17:29:5224 days 14 hrs agoMEXC: Mexc.com IN  Unicly CryptoPunks: uPUNK Token0 Ether0.000674813
0x3442c53aa3aeb84c0ef4a6bc606f0150a33c7e72cae22c84494731872c9d631eTransfer154727942022-09-04 16:59:4424 days 15 hrs ago0x7f88a5c86cd15cd1189757bdbfc717b5eb17e777 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.000454188.74980283
0xa24307239a1f819f3f187610b93bf740fd14c3cd6561117329af69f8e5f90463Transfer154727942022-09-04 16:59:4424 days 15 hrs ago0x1ab398f03ca5ae0cd1dbb736f32899e102818bb3 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.0003153310.5
0x92c945bb4907a2ff2e52d4a9445aa6d2a83027d70ee74cf2ff7b938f4229089fTransfer154727812022-09-04 16:57:5824 days 15 hrs ago0xb86572d600c34a787a3b8b0707bf5e0be327dfa1 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00033198 7.04371872
0x7934f3cee4a991c2698057a5b9963f25c7f74583fa31ad34513ede4a1cfe129bUnbid154705462022-09-04 8:16:2024 days 23 hrs ago0x421d69294ce3d86ff40ca35174ad32fe82f41d05 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00024681 6.1776943
0x942f45b2f49349fec1b173a58ef6cc6acde2c22f3b99a6aaa1fd8259dbe6c86dUnbid154705412022-09-04 8:15:3025 days ago0x421d69294ce3d86ff40ca35174ad32fe82f41d05 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00028332 7.09138281
0xbda6e8df5b2a0ef4ea942c90124554b13c247d99020cae7fb316a09a4571f29dUnbid154705362022-09-04 8:14:1825 days 1 min ago0x421d69294ce3d86ff40ca35174ad32fe82f41d05 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00030356 7.5980153
0xf6a0a9db2b9e6d897797eb2450721cb236d9c34a19f51d809c9c98d2bab629c8Unbid154705362022-09-04 8:14:1825 days 1 min ago0x421d69294ce3d86ff40ca35174ad32fe82f41d05 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00030356 7.5980153
0xc55d067aa4fc4f94133747165c11548044c98b41db4ca8b1b93215de47ac1350Unbid154705352022-09-04 8:14:0525 days 1 min ago0x421d69294ce3d86ff40ca35174ad32fe82f41d05 IN  Unicly CryptoPunks: uPUNK Token0 Ether0.00031219 7.81401125
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x6b28e52c29e2f58c15fc359e68f256df436fc7e37dc07f346e7e763149414bb8154949452022-09-08 6:10:1221 days 2 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.16181856 Ether
0x94b43940abb1cb0449baac571735f41ffb9cd6c07a5526d68e0b17fb735a63da154912332022-09-07 15:59:3021 days 16 hrs ago Unicly CryptoPunks: uPUNK Token 0x906244f8c11d25fa77b0b35fc075372298ae7c0a1.50279896 Ether
0x1483eb4bced77662a57ccb190d96428aa49a6e824ecd65a7836fad887bbdab90154786842022-09-05 15:48:5523 days 16 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.179688 Ether
0xeaa9aef52cc5029ffbcfeb0b61e2bcacb4e0f943dbf9697d0ff70c644a438382154763942022-09-05 6:57:1124 days 1 hr ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.25387264 Ether
0xd4e873d33d26bb5d16aa6766a9978800c72cb3d82cf4fb9c0f1a36337e051ccd154729342022-09-04 17:30:3824 days 14 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.96045872 Ether
0x7934f3cee4a991c2698057a5b9963f25c7f74583fa31ad34513ede4a1cfe129b154705462022-09-04 8:16:2024 days 23 hrs ago Unicly CryptoPunks: uPUNK Token0x421d69294ce3d86ff40ca35174ad32fe82f41d050.01 Ether
0x942f45b2f49349fec1b173a58ef6cc6acde2c22f3b99a6aaa1fd8259dbe6c86d154705412022-09-04 8:15:3025 days ago Unicly CryptoPunks: uPUNK Token0x421d69294ce3d86ff40ca35174ad32fe82f41d050.01 Ether
0xbda6e8df5b2a0ef4ea942c90124554b13c247d99020cae7fb316a09a4571f29d154705362022-09-04 8:14:1825 days 1 min ago Unicly CryptoPunks: uPUNK Token0x421d69294ce3d86ff40ca35174ad32fe82f41d050.01 Ether
0xf6a0a9db2b9e6d897797eb2450721cb236d9c34a19f51d809c9c98d2bab629c8154705362022-09-04 8:14:1825 days 1 min ago Unicly CryptoPunks: uPUNK Token0x421d69294ce3d86ff40ca35174ad32fe82f41d050.01 Ether
0xc55d067aa4fc4f94133747165c11548044c98b41db4ca8b1b93215de47ac1350154705352022-09-04 8:14:0525 days 1 min ago Unicly CryptoPunks: uPUNK Token0x421d69294ce3d86ff40ca35174ad32fe82f41d050.01 Ether
0x78745f352330f33480d80bb7e7d144cc161466461420b9ab55e43124cd8371d5154705342022-09-04 8:14:0425 days 1 min ago Unicly CryptoPunks: uPUNK Token0x421d69294ce3d86ff40ca35174ad32fe82f41d050.01 Ether
0x320a8a944ccf44881c7b1f392c8ce6b4ee5ac87e0b5ccfc65eb0c0c879e727bc152319762022-07-28 16:08:0962 days 16 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.235248 Ether
0x0e263aa9b8be460fdffd090f674704308606b9e4d65ea319ff6b08d74c5d1e9a152270582022-07-27 21:49:1263 days 10 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.16337824 Ether
0x56b36f9dfca206b2783d678a79c0ee5ebfb3091143c5a8641b718d730c48e819151870472022-07-21 16:42:1069 days 15 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.19644736 Ether
0xf964f21f61dc36fe36a27b6347e0b4f44742ab01c06b2b67294bc5d57d3a522b151695822022-07-18 23:36:0972 days 8 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.2331664 Ether
0xd5fd16a04b7d9e583a289b59c9dfd7fdcd58151d8b4aec3ed7710431bff164f7151622822022-07-17 20:32:0473 days 11 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.17766816 Ether
0x9c07662ba421c5c2d0af5c610e544affd7fad2c397771510ff36055bb18c3175151549822022-07-16 17:13:1074 days 15 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.26247701 Ether
0x78bba481a7a6d7ad4cbe958dae6b052ad59b6114301c78e3ac19ea489c735dd3151261062022-07-12 5:55:0079 days 2 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name decentralizedme.eth0.01421904 Ether
0x28ea96c005481aa8d509dd038bd33755784316a704da4c90ee2c4b39f93f7dce150332692022-06-27 7:39:1194 days 36 mins ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.22921824 Ether
0x53b6f34c10b77862e4beb7d825f67a8d7a6fb589bf11bd1f882a9faf4bd74f3b150289032022-06-26 12:10:0794 days 20 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.1981176 Ether
0x59c541730f13848c1c63e439fcff2cdd8145e5e445d10cf6e535feab8e9c2358150279142022-06-26 7:38:2895 days 37 mins ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.27829168 Ether
0x3647f69e0dcf5da7be8ceb73367577b951edb07bcfb2c2549af55bc2a94ef0eb150278622022-06-26 7:21:4995 days 53 mins ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.25921696 Ether
0xa2b3300b6cff92cbee526c9d20c97d03244a0783474a2e2a60ca44ddad69972a150278212022-06-26 7:13:3295 days 1 hr ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.22904896 Ether
0xf1c73ea3137949e2581ce043b5f2ef0d1ad9c0fd05da8bcad308de82892f0e3d150264612022-06-26 1:04:1295 days 7 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.22453664 Ether
0xc08637e69201eda3b6663fa8a9bbf0c5a27598753f35728cae9f46ef6972ec66150264122022-06-26 0:49:3195 days 7 hrs ago Unicly CryptoPunks: uPUNK TokenENS Name ilidan.eth0.21342928 Ether
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x3d9233f15bb93c78a4f07b5c5f7a018630217cb3

Contract Name:
Converter

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-04-01
*/

// File: @openzeppelin/contracts/introspection/ERC165Checker.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Library used to query support of an interface declared via {IERC165}.
 *
 * Note that these functions return the actual result of the query: they do not
 * `revert` if an interface is not supported. It is up to the caller to decide
 * what to do in these cases.
 */
library ERC165Checker {
    // As per the EIP-165 spec, no interface should ever match 0xffffffff
    bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff;

    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Returns true if `account` supports the {IERC165} interface,
     */
    function supportsERC165(address account) internal view returns (bool) {
        // Any contract that implements ERC165 must explicitly indicate support of
        // InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid
        return _supportsERC165Interface(account, _INTERFACE_ID_ERC165) &&
            !_supportsERC165Interface(account, _INTERFACE_ID_INVALID);
    }

    /**
     * @dev Returns true if `account` supports the interface defined by
     * `interfaceId`. Support for {IERC165} itself is queried automatically.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) {
        // query support of both ERC165 as per the spec and support of _interfaceId
        return supportsERC165(account) &&
            _supportsERC165Interface(account, interfaceId);
    }

    /**
     * @dev Returns true if `account` supports all the interfaces defined in
     * `interfaceIds`. Support for {IERC165} itself is queried automatically.
     *
     * Batch-querying can lead to gas savings by skipping repeated checks for
     * {IERC165} support.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
        // query support of ERC165 itself
        if (!supportsERC165(account)) {
            return false;
        }

        // query support of each interface in _interfaceIds
        for (uint256 i = 0; i < interfaceIds.length; i++) {
            if (!_supportsERC165Interface(account, interfaceIds[i])) {
                return false;
            }
        }

        // all interfaces supported
        return true;
    }

    /**
     * @notice Query if a contract implements an interface, does not check ERC165 support
     * @param account The address of the contract to query for support of an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @return true if the contract at account indicates support of the interface with
     * identifier interfaceId, false otherwise
     * @dev Assumes that account contains a contract that supports ERC165, otherwise
     * the behavior of this method is undefined. This precondition can be checked
     * with {supportsERC165}.
     * Interface identification is specified in ERC-165.
     */
    function _supportsERC165Interface(address account, bytes4 interfaceId) private view returns (bool) {
        // success determines whether the staticcall succeeded and result determines
        // whether the contract at account indicates support of _interfaceId
        (bool success, bool result) = _callERC165SupportsInterface(account, interfaceId);

        return (success && result);
    }

    /**
     * @notice Calls the function with selector 0x01ffc9a7 (ERC165) and suppresses throw
     * @param account The address of the contract to query for support of an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @return success true if the STATICCALL succeeded, false otherwise
     * @return result true if the STATICCALL succeeded and the contract at account
     * indicates support of the interface with identifier interfaceId, false otherwise
     */
    function _callERC165SupportsInterface(address account, bytes4 interfaceId)
        private
        view
        returns (bool, bool)
    {
        bytes memory encodedParams = abi.encodeWithSelector(_INTERFACE_ID_ERC165, interfaceId);
        (bool success, bytes memory result) = account.staticcall{ gas: 30000 }(encodedParams);
        if (result.length < 32) return (false, false);
        return (success, abi.decode(result, (bool)));
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol



pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/math/SafeMath.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



pragma solidity >=0.6.0 <0.8.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: @openzeppelin/contracts/introspection/IERC165.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



pragma solidity >=0.6.2 <0.8.0;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

// File: @openzeppelin/contracts/token/ERC1155/IERC1155.sol



pragma solidity >=0.6.2 <0.8.0;


/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values);

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external;
}

// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol



pragma solidity >=0.6.0 <0.8.0;


/**
 * _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {

    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
        external
        returns(bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
        external
        returns(bytes4);
}

// File: @openzeppelin/contracts/introspection/ERC165.sol



pragma solidity >=0.6.0 <0.8.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// File: @openzeppelin/contracts/token/ERC1155/ERC1155Receiver.sol



pragma solidity >=0.6.0 <0.8.0;



/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    constructor() internal {
        _registerInterface(
            ERC1155Receiver(0).onERC1155Received.selector ^
            ERC1155Receiver(0).onERC1155BatchReceived.selector
        );
    }
}

// File: contracts/interfaces/IUnicFactory.sol

pragma solidity >=0.5.0;

interface IUnicFactory {
    event TokenCreated(address indexed caller, address indexed uToken);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getUToken(address uToken) external view returns (uint);
    function uTokens(uint) external view returns (address);
    function uTokensLength() external view returns (uint);

    function createUToken(uint256 totalSupply, uint8 decimals, string calldata name, string calldata symbol, uint256 threshold, string calldata description) external returns (address);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// File: contracts/Converter.sol

pragma solidity 0.6.12;








contract Converter is ERC20, ERC1155Receiver {
    using SafeMath for uint;

    // List of NFTs that have been deposited
    struct NFT {
        address contractAddr;
        uint256 tokenId;
        uint256 amount;
        bool claimed;
    }

    struct Bid {
        address bidder;
        uint256 amount;
        uint time;
    }

    mapping(uint256 => NFT) public nfts;
    // Current index and length of nfts
    uint256 public currentNFTIndex = 0;

    // If active, NFTs can’t be withdrawn
    bool public active = false;
    uint256 public totalBidAmount = 0;
    uint256 public unlockVotes = 0;
    uint256 public _threshold;
    address public issuer;
    string public _description;
    uint256 public cap;

    // Amount of uTokens each user has voted to unlock collection
    mapping(address => uint256) public unlockApproved;

    IUnicFactory public factory;

    // NFT index to Bid
    mapping(uint256 => Bid) public bids;
    // NFT index to address to amount
    mapping(uint256 => mapping(address => uint256)) public bidRefunds;
    uint public constant TOP_BID_LOCK_TIME = 3 days;

    event Deposited(uint256[] tokenIDs, uint256[] amounts, address contractAddr);
    event Refunded();
    event Issued();
    event BidCreated(address sender, uint256 nftIndex, uint256 bidAmount);
    event BidRemoved(address sender, uint256 nftIndex);
    event ClaimedNFT(address winner, uint256 nftIndex, uint256 tokenId);

    bytes private constant VALIDATOR = bytes('JCMY');

    constructor (uint256 totalSupply, uint8 decimals, string memory name, string memory symbol, uint256 threshold, string memory description, address _issuer, IUnicFactory _factory)
        public
        ERC20(name, symbol)
    {
        _setupDecimals(decimals);
        issuer = _issuer;
        _description = description;
        _threshold = threshold;
        factory = _factory;
        cap = totalSupply;
    }

    // deposits an nft using the transferFrom action of the NFT contractAddr
    function deposit(uint256[] calldata tokenIDs, uint256[] calldata amounts, address contractAddr) external {
        require(msg.sender == issuer, "Converter: Only issuer can deposit");
        require(tokenIDs.length <= 50, "Converter: A maximum of 50 tokens can be deposited in one go");
        require(tokenIDs.length > 0, "Converter: You must specify at least one token ID");

        if (ERC165Checker.supportsInterface(contractAddr, 0xd9b67a26)){
            IERC1155(contractAddr).safeBatchTransferFrom(msg.sender, address(this), tokenIDs, amounts, VALIDATOR);

            for (uint8 i = 0; i < 50; i++){
                if (tokenIDs.length == i){
                    break;
                }
                nfts[currentNFTIndex++] = NFT(contractAddr, tokenIDs[i], amounts[i], false);
            }
        }
        else if (ERC165Checker.supportsInterface(contractAddr, 0x80ac58cd)){
            for (uint8 i = 0; i < 50; i++){
                if (tokenIDs.length == i){
                    break;
                }
                IERC721(contractAddr).transferFrom(msg.sender, address(this), tokenIDs[i]);
                nfts[currentNFTIndex++] = NFT(contractAddr, tokenIDs[i], 1, false);
            }
        }

        emit Deposited(tokenIDs, amounts, contractAddr);
    }

    // Function that locks NFT collateral and issues the uTokens to the issuer
    function issue() external {
        require(msg.sender == issuer, "Converter: Only issuer can issue the tokens");
        require(active == false, "Converter: Token is already active");

        active = true;
        address feeTo = factory.feeTo();
        uint256 feeAmount = 0;
        if (feeTo != address(0)) {
            // 0.5% of uToken supply is sent to feeToAddress if fee is on
            feeAmount = cap.div(200);
            _mint(feeTo, feeAmount);
        }

        _mint(issuer, cap - feeAmount);

        emit Issued();
    }

    // Function that allows NFTs to be refunded (prior to issue being called)
    function refund(address _to) external {
        require(!active, "Converter: Contract is already active - cannot refund");
        require(msg.sender == issuer, "Converter: Only issuer can refund");

        // Only transfer maximum of 50 at a time to limit gas per call
        uint8 _i = 0;
        uint256 _index = currentNFTIndex;
        bytes memory data;

        while (_index > 0 && _i < 50){
            NFT memory nft = nfts[_index - 1];

            if (ERC165Checker.supportsInterface(nft.contractAddr, 0xd9b67a26)){
                IERC1155(nft.contractAddr).safeTransferFrom(address(this), _to, nft.tokenId, nft.amount, data);
            }
            else if (ERC165Checker.supportsInterface(nft.contractAddr, 0x80ac58cd)){
                IERC721(nft.contractAddr).safeTransferFrom(address(this), _to, nft.tokenId);
            }

            delete nfts[_index - 1];

            _index--;
            _i++;
        }

        currentNFTIndex = _index;

        emit Refunded();
    }

    function bid(uint256 nftIndex) external payable {
        require(unlockVotes < _threshold, "Converter: Release threshold has been met, no more bids allowed");
        Bid memory topBid = bids[nftIndex];
        require(topBid.bidder != msg.sender, "Converter: You have an active bid");
        require(topBid.amount < msg.value, "Converter: Bid too low");
        require(bidRefunds[nftIndex][msg.sender] == 0, "Converter: Collect bid refund");

        bids[nftIndex] = Bid(msg.sender, msg.value, getBlockTimestamp());
        bidRefunds[nftIndex][topBid.bidder] = topBid.amount;
        totalBidAmount += msg.value - topBid.amount;

        emit BidCreated(msg.sender, nftIndex, msg.value);
    }

    function unbid(uint256 nftIndex) external {
        Bid memory topBid = bids[nftIndex];
        bool isTopBidder = topBid.bidder == msg.sender;
        if (unlockVotes >= _threshold) {
            require(!isTopBidder, "Converter: Release threshold has been met, winner can't unbid");
        }

        if (isTopBidder) {
            require(topBid.time + TOP_BID_LOCK_TIME < getBlockTimestamp(), "Converter: Top bid locked");
            totalBidAmount -= topBid.amount;
            bids[nftIndex] = Bid(address(0), 0, getBlockTimestamp());
            (bool sent, bytes memory data) = msg.sender.call{value: topBid.amount}("");
            require(sent, "Converter: Failed to send Ether");

            emit BidRemoved(msg.sender, nftIndex);
        }
        else { 
            uint256 refundAmount = bidRefunds[nftIndex][msg.sender];
            require(refundAmount > 0, "Converter: no bid found");
            bidRefunds[nftIndex][msg.sender] = 0;
            (bool sent, bytes memory data) = msg.sender.call{value: refundAmount}("");
            require(sent, "Converter: Failed to send Ether");
        }
    }

    // Claim NFT if address is winning bidder
    function claim(uint256 nftIndex) external {
        require(unlockVotes >= _threshold, "Converter: Threshold not met");
        require(!nfts[nftIndex].claimed, "Converter: Already claimed");
        Bid memory topBid = bids[nftIndex];
        require(msg.sender == topBid.bidder, "Converter: Only winner can claim");

        nfts[nftIndex].claimed = true;
        NFT memory winningNFT = nfts[nftIndex];

        if (ERC165Checker.supportsInterface(winningNFT.contractAddr, 0xd9b67a26)){
            bytes memory data;
            IERC1155(winningNFT.contractAddr).safeTransferFrom(address(this), topBid.bidder, winningNFT.tokenId, winningNFT.amount, data);
        }
        else if (ERC165Checker.supportsInterface(winningNFT.contractAddr, 0x80ac58cd)){
            IERC721(winningNFT.contractAddr).safeTransferFrom(address(this), topBid.bidder, winningNFT.tokenId);
        }

        emit ClaimedNFT(topBid.bidder, nftIndex, winningNFT.tokenId);
    }

    // Approve collection unlock
    function approveUnlock(uint256 amount) external {
        require(unlockVotes < _threshold, "Converter: Threshold reached");
        _transfer(msg.sender, address(this), amount);

        unlockApproved[msg.sender] += amount;
        unlockVotes += amount;
    }

    // Unapprove collection unlock
    function unapproveUnlock(uint256 amount) external {
        require(unlockVotes < _threshold, "Converter: Threshold reached");
        require(unlockApproved[msg.sender] >= amount, "Converter: Not enough uTokens locked by user");
        unlockVotes -= amount;
        unlockApproved[msg.sender] -= amount;

        _transfer(address(this), msg.sender, amount);
    }

    // Claim ETH function
    function redeemETH(uint256 amount) external {
        require(unlockVotes >= _threshold, "Converter: Threshold not met");
        // Deposit uTokens
        if (amount > 0) {
            _transfer(msg.sender, address(this), amount);
        }
        // Combine approved balance + newly deposited balance
        uint256 finalBalance = amount + unlockApproved[msg.sender];
        // Remove locked uTokens tracked for user
        unlockApproved[msg.sender] = 0;

        // Redeem ETH corresponding to uToken amount
        (bool sent, bytes memory data) = msg.sender.call{value: totalBidAmount.mul(finalBalance).div(this.totalSupply())}("");
        require(sent, "Converter: Failed to send Ether");
    }

    function getBlockTimestamp() internal view returns (uint) {
        // solium-disable-next-line security/no-block-members
        return block.timestamp;
    }

    /**
     * ERC1155 Token ERC1155Receiver
     */
    function onERC1155Received(address _operator, address _from, uint256 _id, uint256 _value, bytes calldata _data) override external returns(bytes4) {
        if(keccak256(_data) == keccak256(VALIDATOR)){
            return 0xf23a6e61;
        }
    }

    function onERC1155BatchReceived(address _operator, address _from, uint256[] calldata _ids, uint256[] calldata _values, bytes calldata _data) override external returns(bytes4) {
        if(keccak256(_data) == keccak256(VALIDATOR)){
            return 0xbc197c81;
        }
    }

}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://162a98375b9a0d32bad20ab3a262d9d279ef87b720c6b243dbb155c10a8de985
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.